Recounted by KD himself along with other noted '70s enlightenment-seekers, such as author/religious guide Ram Das, psychologist Daniel Goleman and music producer Rick Rubin, the film taps archival photos and 8 mm home-movie footage shot in India to chronicle Kagel's initial trip to the Himalayan foothills, where he embraced beloved guru Maharaj-ji.

"One Track Heart" finds KD discussing his struggles with depression and his addiction to free-base cocaine after Maharaj-ji's death, but also his discovery of his calling as a kirtan chant master.